Alstonia iwahigensis is a tree in the dogbane family Apocynaceae.
Alstonia iwahigensis grows as a medium to large-sized tree up to tall, with a trunk diameter of up to . The bark is greyish, yellowish or dark brown. Its fragrant flowers feature a yellow or pinkish corolla.
Alstonia iwahigensis is native to Borneo and Palawan. The species is found in forests and on hillsides from sea level to altitude.
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